Ralph, are you contacting the Stouffer to the film? That would be my intention, following the issues I encountered doing the WBM tests, described on another thread. You mentioned that you seal against the flash to avoid flare—are you using a camera or a duplicator? I am not sure why significant flare would occur when contacting. Many thanks.
i'm using a self-made slide duplicator, flash from one side and photograph from the other.then, i cover the duplicator with a black cloth to make sue i have no light leaks when photographing into the flash so to speak. i have a picture of the set up somewhere.